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SURFACE WATER MONITORING <br /> rraexsm:uxw:�.:.�zaz.•u:•w::;::�azux:�z:msEa:.<s::ex:ttw•:s:,s:a:w::a::::u.�s»z::t;�aar>:xr�.�:vuaxs:'smzsc:esx<:.rM:.�:z::.xzxa�zzaa:mia�anrceae�,•xtt:ra'raxa+zm <br /> During 1989,quarterly surface water quality and flow analyses were conducted at each of the three stations <br /> located on Stollsteimer Creek. These samplings were conducted during March, June, September and <br /> December. <br /> Methods <br /> During visits to each station, flow measurements were made using a Teledyne-Gurley Model 622 current <br /> meter. Measurements were made by stretching a 100 foot tape across a surveyed cross-section of the creek <br /> and utilizing the USGS six-tenths depth method. In the office,cross-sections were drawn to assess changes in <br /> the stream bed configuration and flows were calculated. Crest gauges,which were established at each station <br /> during 1986, were also serviced during each visit to the site. <br />' During samplings for water quality, measurements for temperature, pH and conductivity were made <br /> utilizing an Orion Research Model 399A portable pH meter and Hack Model 16300 portable conductivity <br /> meter. Prior to field sampling, meters were calibrated with known standards. All other parameters were <br />' collected in precharged bottles and submitted to Chemtech Laboratory in Salt Lake City for analyses. Methods <br /> of analysis were consistent with EPA standard testing procedures. <br /> ' Results <br /> Results of all surface water measurements made during 1985 through 1989 are contained in Appendix 1. <br /> ' A summary of major chemical parameters and flow is presented in Table 1. <br /> Flow data collected at the surface stations on Stollsteimer Creek during 1989 varied from no flow at <br /> ' station S-1 in September and December to a high of 142 cfs at station S-3 in March. Minimal crest events <br /> were recorded at all three stations during June and no crests were recorded during September and December. <br /> As indicated from the flow records, the summer, fall, and winter seasons of 1989 were extremely dry and had <br /> a measurable effect on stream flow and alluvial water levels. In fact, surface station S-1 was dry during the <br /> I September and December samplings which has never occurred during the period of record. Recorded flows <br /> over the five year period ranged from a low of 0 cfs at Station S-1 in September, 1989, to a high of 195 cfs <br /> at station S-1 in March, 1985. Maximum recorded flow was approximately 300 cfs during April, 1986,which <br /> I was estimated at the mine haul road culvert crossing. In terms of average flow, 1985 was the highest and 1989 <br /> was the lowest. Spreadsheets and graphs of flow recorded at each station are presented in Appendix L. <br /> Generally, the peak flow occurs during March to May with low flow during July to October. <br /> I Surface water chemistry was observed to be stable over the five year monitoring period (Table 1 and <br /> Appendix 1). The water may be classified as a mixed calcium/magnesium-sulfate/bicarbonate type water. The <br /> degree of ionization varied with season, being highest during low flow and lowest during high flow. The ratio <br /> I of calcium to magnesium was generally consistent over the seasons; however, there is a shift in the ratio of <br /> sulfate to bicarbonate, with bicarbonate being more prevalent during high flow conditions. These ionic <br /> conditions also influenced the conductivity and TDS as exhibited in the graphs in Appendix 1. <br /> Analysis of trace metals indicates low concentrations. Aluminum and iron were detected in all samplings, <br /> higher values being reported during high flow events (Appendix 1). Manganese and zinc were also sampled <br /> and found in only trace amounts. <br />